Update libg

[aparajit-pratap]

Purpose

Update LibG for the following updates:

• Fix regression with Curve.SplitByPoints and Curve.SplitByParameter for PolyCurve

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated

Release Notes

Fix regression with Curve.SplitByPoints and Curve.SplitByParameter for PolyCurve

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FYIs

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[mjkkirschner]

I think there are some changes from master that should not be in this branch related to .net6

[mjkkirschner]

remove master changes

[aparajit-pratap]

Ugh, I cherry-picked the changes from master. Not sure how this happened, but I'll redo this. Thanks for catching it.

[aparajit-pratap]

@mjkkirschner this now looks just the same as the PR in master. Merging.